batgrbproduct Analysis for Trigger=180274
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Mon Dec 31 11:00:24 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180274/GCN5_download_cron
======================================================================
Trigger: 00180274 Segment: 000
BAT Trigger Time: 160778024 [s; MET]
Trigger Stop: 160778088 [s; MET]
UTC: 2006-02-04T20:33:43.003580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 92.7265504197278 Dec: 70.1706724798407 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 92.7265504197278 Dec: 70.1706724798407 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 92.7122776638654 Dec: 70.1642675375768 [deg; J2000]
{ 06h 10m 50.9s , +70d 09' 51.4" }
+/- 3.62158096232897 [arcmin] (estimated 90% radius based on SNR)
+/- 1.99172431847171 [arcmin] (formal 1-sigma fit error)
SNR: 4.83829541782699
RA = 6h 10m 50.9s (92.712278 deg.)
Dec = 70d 9' 51" (70.164268 deg.)
Angular difference between Flight and Ground position is 0.481765 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.237796 0.354188 0.007035 -0.007618
0.065444 0.066310 0.057276 0.049737 [error]
Peak 0.237796 0.354188 0.007035 -0.007618
0.065444 0.066310 0.057276 0.049737 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.07e-07 1.14e-07 8.62e-08 1.06e-07 3.48e-07 4.14e-07 erg/cm2
Error 3.67e-08 3.50e-08 4.77e-08 1.14e-07 1.18e-07 1.84e-07 erg/cm2
Peak flux Power-law 5.51e-02 3.27e-02 1.23e-02 6.20e-03 1.03e-01 1.06e-01 ph/cm2/s
Error 1.92e-02 9.75e-03 6.60e-03 7.13e-03 2.90e-02 3.00e-02 ph/cm2/s
Fluence Cutoff-PL 9.53e-08 1.57e-07 2.70e-08 1.16e-10 2.80e-07 2.79e-07 erg/cm2
Error 3.63e-08 3.92e-08 4.14e-08 1.13e-08 8.49e-08 8.50e-08 erg/cm2
Peak flux Cutoff-PL 4.71e-02 4.56e-02 4.49e-03 1.05e-05 9.72e-02 9.72e-02 ph/cm2/s
Error 1.86e-02 1.39e-02 6.76e-03 8.64e-04 2.69e-02 2.68e-02 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.405 0.555 - - 5.57e-04 2.32e-04 51.825 57
CPL -2.424 0.000 29.5 6.3 8.88e-01 2.93e+00 47.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.405 0.555 - - 5.57e-04 2.32e-04 51.825 57
CPL -2.424 0.000 29.5 6.3 8.88e-01 2.93e+00 47.590 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
92.7123 +70.1643 0.0398 46.9 -169.5 0.6246 4.8 TRIG_00180274
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40465 ( -0.502687 0.606928 )
Norm@50keV : 5.570108E-04 ( -2.325785E-04 2.309272E-04) )
------------------------------------------------------------
Chi-Squared = 51.82517 using 59 PHA bins.
Reduced chi-squared = 0.9092135 for 57 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 64.00 sec: 0.103342 ( -0.0290181 0.029018 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48085e-07 ( -1.13645e-07 1.21501e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.42391 ( )
Epeak [keV] : 29.5460 ( -5.72853 6.80490 )
Norm@50keV : 0.887913 ( -1.99657 3.85397 )
------------------------------------------------------------
Chi-Squared = 47.58974 using 59 PHA bins.
Reduced chi-squared = 0.8498167 for 56 degrees of freedom
Null hypothesis probability = 0.781
Photon flux (15-150 keV) in 64.00 sec: 9.721415E-02 ( -0.0259887 0.0277649 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79743e-07 ( -7.73946e-08 9.24979e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24365 ( -8.75635 4.39702 )
beta : -9.14459 ( )
Epeak [keV] : 22.0939 ( )
Norm@50keV : 3.276439E-03 ( )
------------------------------------------------------------
Chi-Squared = 49.90059 using 59 PHA bins.
Reduced chi-squared = 0.9072834 for 55 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40465 ( -0.502687 0.606928 )
Norm@50keV : 5.570108E-04 ( -2.325785E-04 2.309272E-04) )
------------------------------------------------------------
Chi-Squared = 51.82517 using 59 PHA bins.
Reduced chi-squared = 0.9092135 for 57 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 64.00 sec: 0.103342 ( -0.0290181 0.029018 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48085e-07 ( -1.13645e-07 1.21501e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.42391 ( )
Epeak [keV] : 29.5460 ( -5.72853 6.80490 )
Norm@50keV : 0.887913 ( -1.99657 3.85397 )
------------------------------------------------------------
Chi-Squared = 47.58974 using 59 PHA bins.
Reduced chi-squared = 0.8498167 for 56 degrees of freedom
Null hypothesis probability = 0.781
Photon flux (15-150 keV) in 64.00 sec: 9.721415E-02 ( -0.0259887 0.0277649 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79743e-07 ( -7.73946e-08 9.24979e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24365 ( -8.75635 4.39702 )
beta : -9.14459 ( )
Epeak [keV] : 22.0939 ( )
Norm@50keV : 3.276439E-03 ( )
------------------------------------------------------------
Chi-Squared = 49.90059 using 59 PHA bins.
Reduced chi-squared = 0.9072834 for 55 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Dec 31 11:31:15 EST 2007